C++析构函数

程序如下，使用VC6.0
#include <iostream.h>
class matrix
{
short rows, cols;
double * elems;
public:
matrix(short rows, short cols);
// ~matrix();
double operator () (short row, short col);
void setelem(short row, short col, double val);
friend matrix operator + (matrix p, matrix q);
friend matrix operator - (matrix p, matrix q);
friend matrix operator * (matrix p, matrix q);
void print();
};

matrix::matrix(short rows, short cols)
{
this->rows = rows;
this->cols = cols;
elems = new double[rows * cols];
}

//matrix::~matrix()
//{
// delete []elems;
//}

double matrix::operator () (short row, short col)
{
return (row >= 1 && row <= rows && col >= 1 && col <= cols) ?
elems[(row - 1) * cols + (col - 1)] : 0.0;
}

void matrix::setelem(short row, short col, double val)

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